in places as revered as the bible, if people were to look ...
Although left out of "modern" Bibles, the Lilith legends include lots of "disguises" and different forms for "her" appearances, and a number of different forms for her "minions."
Ancient Greek, and to lesser extent Roman, myths include numerous dieties who appeared as animals (usually for the purpose of sex?) and a number of humans changed into other forms by p**d off gods.
Lesser known religions had many dieties (my Dictionary of Ancient Dieties claims over 10,000 entries) that "appeared in animal form" but it's unclear for many whether they "changed into" those forms to appear to humans or if those where their usual shapes/forms.